Walbro blowing fuses

[gats0101]

I just got my car together after having an ECU problem and while it was down I installed a Walbro 255. This morning I drove for about 2 hours and had no problems, then after lunch I was leaving a buddies house and the ignition fuse on the battery cable blew. After tearing apart my center console, checking the plugs to the ECU and MPI relay and blowing a couple more fuses (the same ignition fuse) I realized it was the fuel pump causing the blow. The fuse is supposed to be a 30A and I tried a 40A and it still blew. After that I went to a 60A and it ran fine. I just found a 50A at Autozone and put it in and it didn't blow so currently I'm running that. So my question is has this ever happened to anyone before? Currently that with a K&N filter is the only mods on my 92 Laser RS AWD (67,759 miles).

 

[gats0101]

Just curious if this has happened to anybody else or if there might be a problem with my pump.
thanks
sam

 

[absolute_DSM]

Putting in a bigger fuse is not the way to solve the problem.

Think of it like this, something is causing more amperage to be needed to run that pump. That means there is more resistance in the circuit.

Resistance could be a pump going bad.

 

[luv2rallye]

You may have to change your FP relay to go through it's own fuse directly to battery positive. Never put in a higher amp fuse or you may burn up your wiring. If you added something that draws more current than the current circuit's fuse can handle (eg. high performance FP), you must make a new circuit to battery positive with it's own fuse.
[see: http://www.vfaq.com/mods/pump-relay.html although I disagree with saying you can reverse terminals 85 & 86. If you make 86 ground, it will burn out the flyback protection diode inside the relay should it have one (not all do). The relay would probably still work for a while - it just wouldn't have any protection on turning off large current loads which may eventually burn out the relay].

And Absolute_DSM, more amperage is caused by less resistance not more . He changed his FP to a high performance one which draws more current (has less resistance).

 

[eldiabloz13]

Bad ground on the pump when installing?

 

[gats0101]

Turns out the pump was bad. Back to running the stocker until I get another one from SlowBoy.